Core making machine



Dec. 28,1948.

Filed April 21, 1944 R. D. BAYSINGER ET AL CORE MAKING MACHINE 4 Sheets-Sheet 1 R. D. BAYSINGER ET A]; 5

ea. 28, 194s CORE MAKING MACHINE 4 Sheets-Sheet 2 Filed April 21, 1944 I Deb. 28, 1948. R. D. BAYSINGER ET AL. 2,457,196

CORE MAKING MACHINE Filed April 21, 1944 v 4 Sheets-Sheet 3 Dec. 28, 1948. R. D. BAYSINGER ETAL 2,457,196

CORE MAKING MACHINE Filed April 21, 1944 4 Sheets-Sheet 4 SLOW EXHAUST 47 5 AIR PR'SSfl/YE AIR PR5 T0 CYLINDER eorroM 8 I 70 cm. T P

| 6 +10 3 7 All? PRLI'JSURE c w 2% v Patented Dec. 28, 1948 UNITED STATES PATENT OFFICE.

CORE MAKING .MACHINE Illinois Application April 21, 1944, SerialNo. 532,122

Claims. 1

This invention relates to coremaking machines and particularly to machines for making sand cores.

Heretoi'ore it'has been common practice to use :eore- 'making machines/of the "roll-over' type which inherently-require tiring'manual' operations as well as many adjustments to accommodate changes for core-boxes of different sizes. The operatormustimove from one position to another and frequently lift, and roll the heavy corebox table in the operation of moving the coresbox iromwone position-to another. These and other characteristics of such prior types of machine are undesirable not only because of the conditions which impose operatoriatigue but the limitations as to timesper operation and time for changing from one job to another.

Our invention aims to provide a generally improved core-making machine characterized by novel structural features' which make :for time and energy saving while. maintaining a highde- Igreeof uniformity and perfection in'the resultant cores.

In furtherance of this .general object our inventioncontemplates the provision of aimachine so constructed that the operator-does not have to Walk around but completes all coremaking :operations from one positiond-irectly-in front of the machine .andhe-is not required to perform lifting and otherwork operationsin a: stooped or bent over position. One of the features of our inven- -tionis a. pivotally mounted bea-moarrying at one end a base assembly for the coreboX anduat the opposite end ahead assembly includin wa .fiuid operated plunger and clamping head for. automatically clamping and un'clamping the coreplate and box. in response to simple and easy manual control operations. These assemblies are so arranged on the pivoted beam as to provide .a balanced structure :whichrequires a minimum of effort to operate.

Another object of our inventiomi to i provide :a fluid operated. clamping and drawing device together with. a self-adjusting equalizer which :acts against the core-plate .toinsure positive positioning and clamping thereofwunder varying. :conditions andalso insureszsteady and straight drawing of thesand core from the core-box.

Another object is to provide a clamping and drawing device which compensates for variations in thickness of core-plates and core-boxes within *a'. substantial "range; thus eliminating" time and attention wt'o :makin' sset Jnps and adjustments *withi-nvsuchzrange.

'Another objectris :to provide anovel valve tcon- .2 trol .for 'a :fluid operated clamp and 'draw'type coremaking machine.

' A further object is to provide a machine characterized bya novel combination of features which givenew results in core-making.

Other objects and'attendant advantages willvlbe appreciated by .those skilled'rln thisnart as the invention becomes better understood "by reference to the followingdescription-when consideredxin connection with the accompanying drawings, in which Figure 1 'is a .front elevation of a 'corema'king machine embodying our invention, showing the parts in the starting-position;

Figs. 2 and 3' are-top views, Fig. 2 showing the" plunger head assembly swung .to theopen: position as in Fig. l and Fig. 3 "showing said assembly swung tothe operating position;

Fig. 4-is a vfront elevation of the machinewith the plunger. head operated to clamp the core-box and with some of the top parts shown in section;

Fig. 5 is a front elevation of the machine with the beamxassembly swungto the position opposite from Fig. 4 and with the eorewithdrawnirom the core-box;

Fig. 6 is a side elevationzof the-machinetin the positionshown. in Figi;

Fig. '7 is an enlarged vertical section :throug' the cylinder and valve taken substantially-on the section line 1-1 of Fig; .4; 1

Fig. 8 is a .further' enlarged sectionlengthwise through 'the valve taken substantiallyvon .the section line '88.of 7

Figs. 9 .and .10 are cross-sections .ta-kenxsnbstantially on the sectionzlines -9"-9:and :I ll-lz0uol Fig.

Fig. 11 .isan enlarged detail section taken-on the section line 1| I;l I .of Fig. 4.; and

Fig. 12 is a section on a'reduced scale takenion :the section line J-Z l 2-of Fig. :8.

In the drawingswe have :shownan illustrative embodiment of our invention, the general 2&8-

sembl-y being best seen in Figure :6. A main beam [5 pivotallysmounted at its center to turn about-:21. horizontal axis equipped at one end-with a base assembly designated generally: by 116 onwhich a core-box .is clamped and at the otherzen-d withxa head assembly designatedegenerally :by :lrlwwhich carries a cyl-inder and plunger dor performingrthe clamping and drawing-operations end-"an a-ir valve .device'ior controlling these operations. The beam =-is-;carried on ;a trunnion 18 whichsin turn is .journa-led.inwbearings $9 1011 "a suitable iramerstructure 1-21. fllhe. :zbeam :-may 1136 swung freely. ."in 'a-rcounterclockwise direction-from the clamping position shown in Figure 4 to the drawing position shown in Figure 5, and 180 in a clockwise direction back to the starting position. Because of the distribution and balance of weight these operations may be easily performed by hand, I

wise on the beam and carrying a horizontal base 26 on which a core-box 21 is removabl mounted. The core-box has a dovetail 28 on. its underside extending from front to back and fitting between a fixed dovetail member 29 and dovetail clamps 3i which are carried on the base, each clamp 3! being movable by a screw 32 for clamping the corebox in working position and for releasing it when changing from one core-box to another.

The head assembly comprises an upper supporting bracket 33 also clamped to the'beambut adjustable lengthwise thereon and carrying a cylinder 34 on an axisparallelwith'the beam. The cylinder is mounted on the bracket 33 to swing horizontally about avertical pivot pin 35 between an open positionshown inFigures 1 and 2 and a working position shown in Figures 3, 4, and 6. A stop 36 limits the cylinder in the working position. A spring 31'is arranged to yieldingly holds the cylinder either in the open or the closed position by acting at opposite sides of the pivot pin 35, as will be obvious from Figures 2 and 3. A piston plunger 38 having a piston head 39 in the cylinder is equipped at its lower end with spherical socket members 4| and 42 shaped to iit a ball member 43 which is fixed to an equalizing plate 44. By means of a hand screw 45 the socket members are clamped to the ball member with sufficient friction to permit universal movement of the plate 44 for self-adjustment of this plate when it is clamped down against a core-plate 46 vby action of the plunger under air pressure applied in the cylinder against the top of the piston. The plate 44 has on its under face three equally spaced fingers 41a which equalize the contact against the core-plate'and coact with the universal action of the ball and socket connection to give the self-adjusting and equalizing actions described.

The plunger is moved'downwardly under fluid pressure in a clamping operation and also in the opposite direction under fluid pressure in a drawing operation but at a different rate of motion. These operations are under control of a valve device for controlling the fluid pressure. We prefer to use air pressure because it is common in foundries to provide air pressure equipment. Referring particularly to Figures '1, 8, 9, 10, and 12, we have provided a rotary tapered valve 41 fitting in a casing 48 which is supported by pipes 49 and which in turn have suitable connections to opposite ends of the cylinder 34. A compression spring 52 holds the valve seated and the valve may be 'haust openings, as will be presently described.

Movement of the plunger upwardly is limited'by a stop collar 51 which contacts one end of the cylinder as shown in Figure 7. The piston rod or 4 plunger extends through suitable bearings at each end of the cylinder and the upper end of the rod is equipped with a guide member 58, Figures 4 and 11, which slides in a slot in a guide member 58 fixed to the cylinder, thus maintaining the piston and the plate clamping head against rotative displacement. A suitable dust and dirt proof cover 6! encloses'the guide end of the cylinder. Air under pressure is delivered to the cylinder through pipe 62 and a flexible hose connection 63 which connects with the low pressure side of an air supply line. The air pressure is supplied to the machine through a pipe line 64 which passes centrally through the trunnion l8, as shown in Figure 6, and out through the beam at 55, as shown in Figures 1 and 6. From 65 the pressure line branches at 66 to a reduced pressure line 61 which connects with the hose 63 and to a high pressure line 68 in the form of a flexible hose which connects to a conventional vibrator E29 fixed to the supporting bracket 25, as shown in Figure 11' This vibrator, under control of a hand valve 1i serves to give small rapid impulses to the core-boxwhen drawing the core, this being a function well known in the art. The low pressure side of the air line has a pressure regulator 12 and a pressure indi cator 13, best shown in Figure 1, to provide'a predetermined pressure.

Referring to the valve device,'Figures '1 and 8, it willbe observed that constant air pressure enters the casing at 82, and that this air'inletis in constant communication with an annular port 14 in the face of the valve. Port 14 communicates with a valve passage 15-46-11; and by rotative movement of the valve rotor passage 11 connects the air pressure either to the pipe 5!, as shown in Figures 8 and 9, or to the pipe 49 as shown in Figure 10. The valve rotor is also provided on its face with an L-shaped port 18 which has a larger exhaust opening 8| to allow full exhaust of the air during the clamping operation. The valve rotor is also provided on its face with a port 82 designed to communicate the pipe 49 with an exhaust port 83 which has a smallor restricted exhaust opening 84 for controlling exhaust of th air during the core drawing operation. I

Operation of the machine will now be described: The starting position is shown in Figure 1 with the plunger head-swung to the open position. The operator fills the core-box with core sand and levels off the top of the box according to known coremaking practice. The core-plate 46 is then positioned on top of the core-box. The operator then swings the plunger head forward from the open position shown in Figure 2 to work position shown in Figure 3, thus placing the head or pressure plate 44 in position to clamp the coreplate. The operator then moves the hand valve 53 down from the horizontal position shown in Figure 12 to the lower vertical position limited by the stop member 54 engaging the stop" 55. This moves the valve rotor 41 clockwise from the position shown in Figure 9 to Figure 10, thereby conmeeting the air pressure port 11 with the pipe 49 and the upper end of the cylinder and causing the piston to be moved downwardly in a clamping stroke. This brings the plate head or pressure plate 44 against the core-plate 45 and fixedly clamps the core-plate against the core-box. As previously described, the plate 44 has a self'-adjusting and equalizing action which is particularly advantageous because it insures proper clamping of the core-plate automatically and regardless of variations in shape or thickness of the core-plate or in the height of the core-boxwithin a subteas-rang th supporting brackts'? aha-:33

pert =11 with the pipe 5| which was originally described as leading to-tliebettrnbf the cylihder but which now is located at-the top of the cylinder because the cylinder is in the inverted positionshown in Figure 5. The air pressure now moves the plunger downwardly in 0a slow. movementx'controlled by exhaust of the air through the "restricted port 84. Simultaneously with .this control movement of the hand reverts thehperator'inovs the handle 1| putting the vibrator into operation. This produces "slow; steady, and straight drawing of -the core which, combined withthe vibratio aniexceptionally good core drawing. T s lowers th cor'e-pl'a'te 46 to the position shown-'- 5, limited-by the collar 5 striking agamst' the adjacent end of the cylinder, as above described. The operator now removes thecore-plat ifi' with the finished core. -Therbeam assembly will then be swung in a clockwise d" ction to the startin position and upon swin g the plunger headt'o the open position themachine is ready for anpther core-mantis operation.

It will be observed that according to our invention the operator stands at one position in front of the machine and he is not required to manually perform clamping and unclamping operations except as they are performed automatically in response to his actuation of a valve control lever, and that he is not required to lift heavy weights as was necessary in prior machines to lift the core-box and its supporting means in what was known as the roll-over operations. Another advantage of our invention is the elimination of adjustments incidental to variations in individual core-boxes and plates, this being effected by the plunger clamping action and the self-adjusting universal action of the clamping head. The facility with which the upper and lower assemblies may be adjusted on the beam is another feature of material advantage. The fluid controlled drawing operation is a further feature. The parts making up the assemblies are arranged to serve in a practical and satisfactory manner the objects of our invention.

While we have shown a particular embodiment of our invention, it will be understood that we do not wish to be limited thereto since many modifications may be made, and we therefore contemplate by the appended claims to cover any such modifications as fall within the true spirit and scope of our invention.

We claim:

1. In a coremaking machine, in combination, a beam structure pivotally mounted intermediate its ends to turn about a horizontal axis, a bracket mounted on one end portion of the s it liin'i't determined bean-1 streeuzre, eereboxmmaerdispdsed on said bracket r'r'or positively securing wthe mere-- bbx-thitb, a need-assembly 'mounted an the W perm-en 6f the -beam""stru'cture g a cylinder and 'a plunger cparable in the cylinder and equipped with a head adaptedto engage apore-plate and clam'p-vit against the c'or'eebox' by the operation of fluid pressure inlthe cylinder against the piston plung er, the beam structure "being rotatively movable aboutiitsis'upportto locate the bracket either. at a-ilo'werepos-ition. at'fiWhiCh the. core 'b'ox is to be ifill ed and clamped or to an upper position at which thecore-box inverted and thecylinder is Iunderhea'thxinaposition for drawing the core downwardlyp'stop means for positively =positioningsaidbeam structure'in the foregoing positions, a. high-pressure, "high speed vibrator associated with'the core-hexholder, a valve device 'for di-- re-cting fluid pressure to either end of the cylinder in response-to valve control'movements, adlui'd pressures-supply having a line leading to the vibrator --and-another "line leading to the valve device, anda pressure reducing regulator in the line "leading to the valve device.

2. .A coremaking'm-achine having, in combina tionwith a core-boxand a core-plate, means for positively holding-the core-boxand normally supporting the core-box in an upright position forma-king the core, a cylinder supported in a vertical positionabove the core-box having a piston plunger equipped at its lower end with a clamping head adapted upon the down stroke of the plungerfor-clamping the core-plate against the core-box, and fluid pressure-control means for eontrollingfiuid pressure'to the cylinder including ,a valve ievice having a valve member operableto direct fluid pressure to the top of the cylinder ton-moving the plungerin said clamping stroke and operable to direct fluid pressure to the op-. posite end of the cylinder for moving the-plunger in';;a. core drawi-ng stroke, means restricting the cylinder exhaust of the fluid pressure to efiect a slower stroke for said core drawing than for said clamping, the described parts constituting an assembly mounted for reversal to locate the corebox in an upper inverted position in which the plunger is operable in said core drawing stroke.

3. In a machine of the character described, in combination, a beam structure pivotally mounted intermediate its ends to turn about a horizontal axis, a base plate mounted on one end portion of the beam structure, a core-box holder disposed on said base plate for positively securing the core-box thereto, a head assembly mounted on the opposite end portion of the beam structure and including a cylinder and a piston plunger operable in the cylinder and equipped with a head adapted to engage a core-plate and clamp it against the corebox by the operation of fluid pressure in the cylinder against the piston plunger, the beam structure being rotatively movable about its support to locate the base plate either at a lower position at which the core-box is to be filled and clamped or to an upper position at which the core-box is inverted and the cylinder is underneath in a position for drawing the core downwardly, the piston plunger being equipped at its lower end with a plate for clamping the core-plate, and a universal connection constructed and arranged to give to said plate a self-adjusting and equalizing action when heating it under pressure of the plunger against the core-plate, whereby said action automatically insures proper clamping of the core plate against the core-box regardless of variations 7 in thickness of the core-plate or in height of the core-box within a substantial range.

4. In a machine of the character described, in combination, a beam structure pivotally mounted intermediate its ends to turn about a horizontal axis, a base mounted on one end portion of the beam structure, a core-box holder for positively securing the core-box to the base, a head assembly mounted on the opposite end portion of the beam structure and including a cylinder and a piston plunger operable in the cylinder and equipped with a head adapted to engage accreplate and clamp it against the core-box by the operation of fluid pressure in the cylinder against thepiston plunger, the beam structure being rotatively movable about its support to locate the base either at a lower position at which the core-box is to be filled and clamped or to an upper position at which the core-box is inverted and the cylinder is underneath in a position for drawing the core downwardly, and a valve device for controlling the supply of fluid pressure to either end of said cylinder and for controlling the exhaust of said pressure from the cylinder, said fluid pressure operating the plunger in one direction in a core-plate clamping stroke, the valve device having an exhaust opening arranged for fast exhaust of the fluid pressure during said clamping stroke and having a separate exhaust opening arranged for slow exhaust of the fluid pressure during said core drawing stroke.

5. In a machine of the character described, in combination, a beam structure pivotally mounted intermediate its ends to turn about a horizontal axis, a base mounted on one end portion of the beam structure, a core-box holder for positively securing the core-box in a pre-selected position, a head assembly mounted on the opposite end portion of the beam structure and including a cylinder and a piston plunger operable'in the cylinder and equipped with a head adapted to engage a core-plate and clamp it against the core-box by the operation of fluid pressurein the cylinder against the piston plunger, the :beam structure being rotatively movable aboutits support to locate the base either at a lower :position at which the core-box is to be filled and clamped or to an upper position at which the core-box is inverted and the cylinder is underneath in a position for drawing the core downwardly, and a valve device on the head assembly comprising a casing, a rotary tapered valve fitting in the casing, a hand lever for rotatively moving saidvalve, a fluid pressure supply lead to the casing, a slow exhaust opening and a fast exhaust opening in the casing, port communications between the casing and opposite ends of the cylinder, and ports in the valve and in the casing for communicating said fluid pressure supply with the cylinder and with the respective exhaust ports to elfect a fast clamping stroke of the plunger and a slow core drawing stroke. 7

ROYAL D. BAYSINGER. LYLE W. FULTON.

REFERENCES CITED The following references are of record in the file'of this patent:

UNITED STATES PATENTS A Number Name Date 754,495 Penrose Mar. 15, 1904 821,791 Duncan May 29, 1906 967,565 Rohan Aug. 16, 1910 1,726,024 Harmes Aug. 27, 1929 1,910,354 Nicholle May 23, .1933 2,122,022 Campbell June 28, 1938 2,350,253 Shaffer May 30,1944

FOREIGN PATENTS Number Country Date 5,570 Great Britain 1913 178,492 Great Britain Apr. 18, 1922 

